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Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
December 1, 2009
0Patent Application Number
120835310
Date Filed
November 6, 2006
0Patent Primary Examiner
Patent abstract
A method of calibrating a scale measurement apparatus. A scale has scale markings arranged to form an incremental pattern and at least one scale mark. A readhead has an incremental detector means which produces an output signal and a scale mark detector means for producing a signal having a zero crossing. The readhead is moved relative to the scale. The output from the incremental detector is used to determine a predetermined phase in the output signal and the value of the signal from the scale mark detector corresponding to the predetermined phase in the output signal from the incremental detector on either side of the zero crossing is determined. These values are used to define the width of the scale mark pulse.
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